The Spanish word 'hematología' (hematology) comes from combining two Ancient Greek elements. The first part comes from the Greek word 'αἷμα' (haima) meaning 'blood', specifically from its genitive form 'αἷματος' (haimatos), which developed into the combining form 'hemato-'. The second part comes from combining the Greek 'λόγος' (logos) meaning 'word, discourse' with the abstract noun suffix '-ία' (-ia) to form '-logía', meaning 'study of'. When these elements were combined, they created 'hematología', literally meaning 'the study of blood'.

This word formation pattern of combining Greek elements to create scientific terms was common during the development of modern medical terminology, making it part of an international scientific vocabulary that is similar across many languages.

Some related Spanish medical terms that share the 'hemato-' root include 'hemático' (relating to blood), 'hematoma' (a collection of blood outside blood vessels), and 'hemorragia' (hemorrhage). The '-logía' ending is found in many Spanish scientific terms like 'biología' (biology), 'psicología' (psychology), and 'geología' (geology).

English speakers will recognize this word easily as it's very similar to the English word 'hematology'. Other related English words sharing the 'hemat-/haem-' root include 'hematoma', 'hemorrhage', and 'hemoglobin'. The '-logy' suffix is extremely common in English scientific terms, appearing in words like 'biology', 'psychology', and 'geology', all of which share the same Greek origin as Spanish '-logía'.